18,000 watt sealed flower room build.

[grow nerd]

Santa Fe's and other high efficiency units put out much less heat per pint of water removed than less efficient units such as portable big box store units (Kenmore, LG, etc). There are further vicious cycles that can be created when running inefficient DH's, as it will cause your AC to run longer.

General rule of thumb is more power drawn = more heat output. It will always be cheaper and electrically more efficient to change the air out than to condition it using refrigerant compressor based devices (AC, DH).

Switching to fresh air exchange during lights out can save some electricity, but I expect it might not be that much if only doing a one-time dump.

 

[sureshot66]

prop215

i dunno your specs but use a big fan, the 2 dehus i run are big ass commercials and only pull 15 amps

 

[stoney917]

This thread is great love seeing things done from ground up is very educational and def gonna help me out a ton in the future... can u take a pic of your electrical. ... neway mad props on showing ur hard work,,,

 

[Marshall]

I ran 2 14kw rooms sog style (8 4x8 tables) with one santa fe per room and never had an issue.

A santa fe pulls around the same amperage as a small retail unit yet removes much more humidity. I can't remember the specifics but there are some standards for dehumidifier testing. You need to compare apples to apples

 

[grow nerd]

I ran 2 14kw rooms sog style (8 4x8 tables) with one santa fe per room and never had an issue.

What does "never had an issue" mean, that you were able to keep your RH in a sealed environment where you wanted / set it, or had high RH but never lost much to budrot but could have potentially had better results with lower RH?

A santa fe pulls around the same amperage as a small retail unit yet removes much more humidity. I can't remember the specifics but there are some standards for dehumidifier testing. You need to compare apples to apples

AHAM

 

[Storm Shadow]

10000% Dampers when lights go out.....then when lights come... Damper CLoses and just recirculates in the room

 

[Nifty_PoT]

^ But what about when the 'outside' RH is above 70% ? wouldn't it be better to have a sealed room with big dehuey?

 

[Storm Shadow]

Your Pulling Air out.....that's it....when the lights are out.... don't use a small fan,,, I use a 14" Max-Fan for when the lights are out in my containers... which are much are sealed then almost any room you can build

 

[Nifty_PoT]

I understand what you are saying , but when you pull air out , there's coming air in somewhere, right? so hence me asking if outside is high RH(which is half of the year around here) , it would seem sealing the room and putting in deheuy would be better , also if you move that amount of high RH air through the room at night , there is gona be alot of pathogens in that air , very risky i think ?

 

[grow nerd]

Those were the concerns, so I never vented out. Plus it's much simpler than filtering the intake

 

[Storm Shadow]

Air Conditioners will not keep the Humidity levels in check with lights off... and There isn't a Dehumidifier that can keep up with a large grow... hence the reason for multiple units which isn't cost effective by any means...

Cold Air from the AC's being pulled out of the room at night... your good to go.. I'll post pics soon of how I do it...

 

[sureshot66]

^agreed, much easier and effective to vent then stack dehuys famco makes a really good vent if you guys are looking...i pretty much follow vpd for temp humidity equation and use eagle 20 and i have no mold or pm issues

 

[grow nerd]

You don't need dehumidifiers during the day?

 

[sureshot66]

You don't need dehumidifiers during the day?

sup nerd, i guess that depends on your environment..i use humidifiers in veg and early flower, i run my humidity up to 70%,mid flower im in the 60's, my dehus on a controller so it cycles on n off.. then bring it down aggressively in the last 3 weeks 50s%

 

[grow nerd]

Air Conditioners will not keep the Humidity levels in check with lights off... and There isn't a Dehumidifier that can keep up with a large grow... hence the reason for multiple units which isn't cost effective by any means...

There are, but they're typically not (fully) refrigerant/compressor-based and not very practical cost- or installation-wise.

Cold Air from the AC's being pulled out of the room at night... your good to go.. I'll post pics soon of how I do it...

Still doesn't address that the RH will always be at least the outside air's RH (assuming same temperature). If the outside air is relatively dry, no problem. But what if you're in the Everglades with 100% RH outside? You're not pulling a vacuum with those fans, and what air you pull out is replaced with the air you're pulling in, whether through designed intakes or through seams / cracks / leaks.

 

[Marshall]

What does "never had an issue" mean, that you were able to keep your RH in a sealed environment where you wanted / set it, or had high RH but never lost much to budrot but could have potentially had better results with lower RH?


AHAM

Think humidity was set around 50% and it was always in check. Every room is different though. I didn't have reses in the room so no evaporation there. As a sog plants were usually small. And each room had a split ac system that probably helped dehumidify. Sealed room with co2 burner, air cooled lights

 

[DrKanobie]

This is a picture taken from the middle of the room day 5 of flower. I took this picture shorty after feeding.





These are my room readings. I have since moved my temp up to 80 degrees and everything is going fine. The plants are feeding daily and are looking very healthy. I am not running any dehumidifiers in my room and the highest humidity I see is about 60% for about 20 minutes or so after feeding. I'm am still trying to get this co2 temp ratio dialed in. I'm currently at 80 degrees and 1500ppm.

 

[sensibuds]

Beautiful setup bro. Looks like you have er dialed in

 

[DrKanobie]

I never vent the air in my room and my humidity hovers around 45% durning the dark cycle. I will try to take some shots of my dark readings sometime soon. I'm also getting ready to frame out 2 more 18k rooms in my building, I plan on starting this week.

 

[grow nerd]

How many circulation fans in there, wall-mount or otherwise? I saw 3, but thinking there might be 3 more? (2 on long wall, 1 on narrow wall?) Are you seeing much wet transpiration marks on overlapping leaves?

I have a feeling you're going to have major humidity and/or powdery mildew issues in the near future. IMO you should get more dehumidifiers, and finish out the first room successfully before spending all your money on firing up additional rooms, only to find out that you need more money for dehumidifiers late in the game to successfully finish out the first room.

You are also not getting the full affects of CO2 enrichment at 78*, and IMO should be quite warmer earlier on where they gain the most advantage from it.